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It is mandatory to procure user consent prior to running these cookies on your website. Juni 21, Montes are named for the word "hot" in a variety of languages.

Plains or planitiae are named for Mercury in various languages. Valleys or valles are named for abandoned cities, towns, or settlements of antiquity.

Mercury was heavily bombarded by comets and asteroids during and shortly following its formation 4. Mercury's surface is more heterogeneous than either Mars 's or the Moon 's, both of which contain significant stretches of similar geology, such as maria and plateaus.

Craters on Mercury range in diameter from small bowl-shaped cavities to multi-ringed impact basins hundreds of kilometers across.

They appear in all states of degradation, from relatively fresh rayed craters to highly degraded crater remnants.

Mercurian craters differ subtly from lunar craters in that the area blanketed by their ejecta is much smaller, a consequence of Mercury's stronger surface gravity.

At the antipode of the Caloris Basin is a large region of unusual, hilly terrain known as the "Weird Terrain". One hypothesis for its origin is that shock waves generated during the Caloris impact traveled around Mercury, converging at the basin's antipode degrees away.

The resulting high stresses fractured the surface. Overall, about 15 impact basins have been identified on the imaged part of Mercury.

There are two geologically distinct plains regions on Mercury. Smooth plains are widespread flat areas that fill depressions of various sizes and bear a strong resemblance to the lunar maria.

Notably, they fill a wide ring surrounding the Caloris Basin. Unlike lunar maria, the smooth plains of Mercury have the same albedo as the older inter-crater plains.

Despite a lack of unequivocally volcanic characteristics, the localisation and rounded, lobate shape of these plains strongly support volcanic origins.

It is not clear whether they are volcanic lavas induced by the impact, or a large sheet of impact melt.

One unusual feature of Mercury's surface is the numerous compression folds, or rupes , that crisscross the plains. As Mercury's interior cooled, it contracted and its surface began to deform, creating wrinkle ridges and lobate scarps associated with thrust faults.

The Lunar Reconnaissance Orbiter discovered that similar small thrust faults exist on the Moon. It is thus a " compound volcano ". Although the daylight temperature at the surface of Mercury is generally extremely high, observations strongly suggest that ice frozen water exists on Mercury.

Mercury is too small and hot for its gravity to retain any significant atmosphere over long periods of time; it does have a tenuous surface-bounded exosphere [73] containing hydrogen , helium , oxygen , sodium , calcium , potassium and others at a surface pressure of less than approximately 0.

Hydrogen atoms and helium atoms probably come from the solar wind , diffusing into Mercury's magnetosphere before later escaping back into space.

Radioactive decay of elements within Mercury's crust is another source of helium, as well as sodium and potassium.

Water vapor is present, released by a combination of processes such as: comets striking its surface, sputtering creating water out of hydrogen from the solar wind and oxygen from rock, and sublimation from reservoirs of water ice in the permanently shadowed polar craters.

Sodium, potassium and calcium were discovered in the atmosphere during the —s, and are thought to result primarily from the vaporization of surface rock struck by micrometeorite impacts [78] including presently from Comet Encke.

This would indicate an interaction between the magnetosphere and the planet's surface. Despite its small size and slow day-long rotation, Mercury has a significant, and apparently global, magnetic field.

According to measurements taken by Mariner 10 , it is about 1. The magnetic-field strength at Mercury's equator is about nT.

It is likely that this magnetic field is generated by a dynamo effect, in a manner similar to the magnetic field of Earth. Particularly strong tidal effects caused by the planet's high orbital eccentricity would serve to keep the core in the liquid state necessary for this dynamo effect.

Mercury's magnetic field is strong enough to deflect the solar wind around the planet, creating a magnetosphere. The planet's magnetosphere, though small enough to fit within Earth, [81] is strong enough to trap solar wind plasma.

This contributes to the space weathering of the planet's surface. Bursts of energetic particles in the planet's magnetotail indicate a dynamic quality to the planet's magnetosphere.

The spacecraft encountered magnetic "tornadoes" — twisted bundles of magnetic fields connecting the planetary magnetic field to interplanetary space — that were up to km wide or a third of the radius of the planet.

These twisted magnetic flux tubes, technically known as flux transfer events , form open windows in the planet's magnetic shield through which the solar wind may enter and directly impact Mercury's surface via magnetic reconnection [87] This also occurs in Earth's magnetic field.

Mercury has the most eccentric orbit of all the planets; its eccentricity is 0. It takes The diagram illustrates the effects of the eccentricity, showing Mercury's orbit overlaid with a circular orbit having the same semi-major axis.

Mercury's higher velocity when it is near perihelion is clear from the greater distance it covers in each 5-day interval. In the diagram the varying distance of Mercury to the Sun is represented by the size of the planet, which is inversely proportional to Mercury's distance from the Sun.

This varying distance to the Sun leads to Mercury's surface being flexed by tidal bulges raised by the Sun that are about 17 times stronger than the Moon's on Earth.

Mercury's orbit is inclined by 7 degrees to the plane of Earth's orbit the ecliptic , as shown in the diagram on the right. As a result, transits of Mercury across the face of the Sun can only occur when the planet is crossing the plane of the ecliptic at the time it lies between Earth and the Sun, which is in May or November.

This occurs about every seven years on average. Mercury's axial tilt is almost zero, [91] with the best measured value as low as 0.

This means that to an observer at Mercury's poles, the center of the Sun never rises more than 2. At certain points on Mercury's surface, an observer would be able to see the Sun peek up a little more than two-thirds of the way over the horizon, then reverse and set before rising again, all within the same Mercurian day.

Thus, to a hypothetical observer on Mercury, the Sun appears to move in a retrograde direction. Four Earth days after perihelion, the Sun's normal apparent motion resumes.

For the same reason, there are two points on Mercury's equator, degrees apart in longitude , at either of which, around perihelion in alternate Mercurian years once a Mercurian day , the Sun passes overhead, then reverses its apparent motion and passes overhead again, then reverses a second time and passes overhead a third time, taking a total of about 16 Earth-days for this entire process.

In the other alternate Mercurian years, the same thing happens at the other of these two points. The amplitude of the retrograde motion is small, so the overall effect is that, for two or three weeks, the Sun is almost stationary overhead, and is at its most brilliant because Mercury is at perihelion, its closest to the Sun.

This prolonged exposure to the Sun at its brightest makes these two points the hottest places on Mercury. Maximum temperature occurs when the Sun is at an angle of about 25 degrees past noon due to diurnal temperature lag , at 0.

These points, which are the ones on the equator where the apparent retrograde motion of the Sun happens when it is crossing the horizon as described in the preceding paragraph, receive much less solar heat than the first ones described above.

Mercury attains inferior conjunction nearest approach to Earth every Earth days on average, [3] but this interval can range from days to days due to the planet's eccentric orbit.

Mercury can come as near as This large range arises from the planet's high orbital eccentricity. The longitude convention for Mercury puts the zero of longitude at one of the two hottest points on the surface, as described above.

However, when this area was first visited, by Mariner 10 , this zero meridian was in darkness, so it was impossible to select a feature on the surface to define the exact position of the meridian.

Therefore, a small crater further west was chosen, called Hun Kal , which provides the exact reference point for measuring longitude.

A International Astronomical Union resolution suggests that longitudes be measured positively in the westerly direction on Mercury.

For many years it was thought that Mercury was synchronously tidally locked with the Sun, rotating once for each orbit and always keeping the same face directed towards the Sun, in the same way that the same side of the Moon always faces Earth.

Radar observations in proved that the planet has a spin-orbit resonance, rotating three times for every two revolutions around the Sun.

The eccentricity of Mercury's orbit makes this resonance stable—at perihelion, when the solar tide is strongest, the Sun is nearly still in Mercury's sky.

The rare resonant tidal locking is stabilized by the variance of the tidal force along Mercury's eccentric orbit, acting on a permanent dipole component of Mercury's mass distribution.

However, with noticeable eccentricity, like that of Mercury's orbit, the tidal force has a maximum at perihelion and therefore stabilizes resonances, like , enforcing that the planet points its axis of least inertia roughly at the Sun when passing through perihelion.

The original reason astronomers thought it was synchronously locked was that, whenever Mercury was best placed for observation, it was always nearly at the same point in its resonance, hence showing the same face.

This is because, coincidentally, Mercury's rotation period is almost exactly half of its synodic period with respect to Earth.

Due to Mercury's spin-orbit resonance, a solar day the length between two meridian transits of the Sun lasts about Earth days. Simulations indicate that the orbital eccentricity of Mercury varies chaotically from nearly zero circular to more than 0.

In , the French mathematician and astronomer Urbain Le Verrier reported that the slow precession of Mercury's orbit around the Sun could not be completely explained by Newtonian mechanics and perturbations by the known planets.

He suggested, among possible explanations, that another planet or perhaps instead a series of smaller 'corpuscules' might exist in an orbit even closer to the Sun than that of Mercury, to account for this perturbation.

The success of the search for Neptune based on its perturbations of the orbit of Uranus led astronomers to place faith in this possible explanation, and the hypothetical planet was named Vulcan , but no such planet was ever found.

The perihelion precession of Mercury is 5, arcseconds 1. Newtonian mechanics, taking into account all the effects from the other planets, predicts a precession of 5, arcseconds 1.

The effect is small: just Similar, but much smaller, effects exist for other Solar System bodies: 8. Filling in the values gives a result of 0.

This is in close agreement with the accepted value of Mercury's perihelion advance of There may be scientific support, based on studies reported in March , for considering that parts of the planet Mercury may have been habitable , and perhaps that life forms , albeit likely primitive microorganisms , may have existed on the planet.

Mercury can be observed for only a brief period during either morning or evening twilight. Mercury can, like several other planets and the brightest stars, be seen during a total solar eclipse.

Like the Moon and Venus, Mercury exhibits phases as seen from Earth. It is "new" at inferior conjunction and "full" at superior conjunction.

The planet is rendered invisible from Earth on both of these occasions because of its being obscured by the Sun, [] except its new phase during a transit.

Mercury is technically brightest as seen from Earth when it is at a full phase. Although Mercury is farthest from Earth when it is full, the greater illuminated area that is visible and the opposition brightness surge more than compensates for the distance.

Nonetheless, the brightest full phase appearance of Mercury is an essentially impossible time for practical observation, because of the extreme proximity of the Sun.

Mercury is best observed at the first and last quarter, although they are phases of lesser brightness.

The first and last quarter phases occur at greatest elongation east and west of the Sun, respectively.

At both of these times Mercury's separation from the Sun ranges anywhere from Mercury can be easily seen from the tropics and subtropics more than from higher latitudes.

Viewed from low latitudes and at the right times of year, the ecliptic intersects the horizon at a steep angle. At middle latitudes , Mercury is more often and easily visible from the Southern Hemisphere than from the Northern.

This is because Mercury's maximum western elongation occurs only during early autumn in the Southern Hemisphere, whereas its greatest eastern elongation happens only during late winter in the Southern Hemisphere.

An alternate method for viewing Mercury involves observing the planet during daylight hours when conditions are clear, ideally when it is at its greatest elongation.

Care must be taken to ensure the instrument isn't pointed directly towards the Sun because of the risk for eye damage. This method bypasses the limitation of twilight observing when the ecliptic is located at a low elevation e.

Ground-based telescope observations of Mercury reveal only an illuminated partial disk with limited detail.

The Hubble Space Telescope cannot observe Mercury at all, due to safety procedures that prevent its pointing too close to the Sun.

Because the shift of 0. The earliest known recorded observations of Mercury are from the Mul. Apin tablets.

These observations were most likely made by an Assyrian astronomer around the 14th century BC. Apin tablets is transcribed as Udu.

Ud "the jumping planet". The Babylonians called the planet Nabu after the messenger to the gods in their mythology. The ancients knew Mercury by different names depending on whether it was an evening star or a morning star.

By about BC, the ancient Greeks had realized the two stars were one. The Greco - Egyptian [] astronomer Ptolemy wrote about the possibility of planetary transits across the face of the Sun in his work Planetary Hypotheses.

He suggested that no transits had been observed either because planets such as Mercury were too small to see, or because the transits were too infrequent.

It was associated with the direction north and the phase of water in the Five Phases system of metaphysics.

In India, the Kerala school astronomer Nilakantha Somayaji in the 15th century developed a partially heliocentric planetary model in which Mercury orbits the Sun, which in turn orbits Earth, similar to the Tychonic system later proposed by Tycho Brahe in the late 16th century.

The first telescopic observations of Mercury were made by Galileo in the early 17th century.

Although he observed phases when he looked at Venus, his telescope was not powerful enough to see the phases of Mercury. In , Pierre Gassendi made the first telescopic observations of the transit of a planet across the Sun when he saw a transit of Mercury predicted by Johannes Kepler.

In , Giovanni Zupi used a telescope to discover that the planet had orbital phases similar to Venus and the Moon. The observation demonstrated conclusively that Mercury orbited around the Sun.

A rare event in astronomy is the passage of one planet in front of another occultation , as seen from Earth. Mercury and Venus occult each other every few centuries, and the event of May 28, is the only one historically observed, having been seen by John Bevis at the Royal Greenwich Observatory.

The difficulties inherent in observing Mercury mean that it has been far less studied than the other planets. The effort to map the surface of Mercury was continued by Eugenios Antoniadi , who published a book in that included both maps and his own observations.

In June , Soviet scientists at the Institute of Radio-engineering and Electronics of the USSR Academy of Sciences , led by Vladimir Kotelnikov , became the first to bounce a radar signal off Mercury and receive it, starting radar observations of the planet.

Pettengill and Rolf B. Dyce, using the meter Arecibo Observatory radio telescope in Puerto Rico , showed conclusively that the planet's rotational period was about 59 days.

If Mercury were tidally locked, its dark face would be extremely cold, but measurements of radio emission revealed that it was much hotter than expected.

Astronomers were reluctant to drop the synchronous rotation theory and proposed alternative mechanisms such as powerful heat-distributing winds to explain the observations.

Italian astronomer Giuseppe Colombo noted that the rotation value was about two-thirds of Mercury's orbital period, and proposed that the planet's orbital and rotational periods were locked into a rather than a resonance.

Instead, the astronomers saw the same features during every second orbit and recorded them, but disregarded those seen in the meantime, when Mercury's other face was toward the Sun, because the orbital geometry meant that these observations were made under poor viewing conditions.

Ground-based optical observations did not shed much further light on Mercury, but radio astronomers using interferometry at microwave wavelengths, a technique that enables removal of the solar radiation, were able to discern physical and chemical characteristics of the subsurface layers to a depth of several meters.

Moreover, recent technological advances have led to improved ground-based observations. In , high-resolution lucky imaging observations were conducted by the Mount Wilson Observatory 1.

They provided the first views that resolved surface features on the parts of Mercury that were not imaged in the Mariner 10 mission.

Reaching Mercury from Earth poses significant technical challenges, because it orbits so much closer to the Sun than Earth.

Therefore, the spacecraft must make a large change in velocity delta-v to enter a Hohmann transfer orbit that passes near Mercury, as compared to the delta-v required for other planetary missions.

The potential energy liberated by moving down the Sun's potential well becomes kinetic energy ; requiring another large delta-v change to do anything other than rapidly pass by Mercury.

To land safely or enter a stable orbit the spacecraft would rely entirely on rocket motors. Aerobraking is ruled out because Mercury has a negligible atmosphere.

A trip to Mercury requires more rocket fuel than that required to escape the Solar System completely.

As a result, only two space probes have visited it so far. The second close approach was primarily used for imaging, but at the third approach, extensive magnetic data were obtained.

The data revealed that the planet's magnetic field is much like Earth's, which deflects the solar wind around the planet.

For many years after the Mariner 10 encounters, the origin of Mercury's magnetic field remained the subject of several competing theories.

On March 24, , just eight days after its final close approach, Mariner 10 ran out of fuel. Because its orbit could no longer be accurately controlled, mission controllers instructed the probe to shut down.

It made a fly-by of Earth in August , and of Venus in October and June to place it onto the correct trajectory to reach an orbit around Mercury.

The probe successfully entered an elliptical orbit around the planet on March 18, The first orbital image of Mercury was obtained on March 29, The probe finished a one-year mapping mission, [] and then entered a one-year extended mission into The mission was designed to clear up six key issues: Mercury's high density, its geological history, the nature of its magnetic field , the structure of its core, whether it has ice at its poles, and where its tenuous atmosphere comes from.

To this end, the probe carried imaging devices that gathered much-higher-resolution images of much more of Mercury than Mariner 10 , assorted spectrometers to determine abundances of elements in the crust, and magnetometers and devices to measure velocities of charged particles.

Measurements of changes in the probe's orbital velocity were expected to be used to infer details of the planet's interior structure.

The European Space Agency and the Japanese Space Agency developed and launched a joint mission called BepiColombo , which will orbit Mercury with two probes: one to map the planet and the other to study its magnetosphere.

Both probes will operate for one terrestrial year. From Wikipedia, the free encyclopedia. For other uses, see Mercury disambiguation.

Smallest and innermost planet from the Sun in the Solar System.

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